Sedimentary Controlling Factor of Unattached Multiple Superimposed Coalbed-Methane System Formation
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摘要: 基于黔西地区晚二叠世含煤地层的实测资料, 初步探讨了"多层叠置独立含煤层气系统"形成的沉积控制因素.研究表明, 含煤地层的沉积条件奠定了"多层叠置独立含煤层气系统"的物质及物性基础, 层序地层格架特点限定了含气单元间含气性的连通性.最大海泛面附近的菱铁质泥岩等低渗透岩层控制了垂向次级含气单元间的含气性相对独立, 且煤层含气量与海平面升降之间存在一定的相关性, 即最大海侵面附近煤层含气量相对较低, 此界面似乎可作为含煤层气系统内独立含气单元的成藏边界; 层序界面沟通了含气单元间的含气联系, 使得靠近层序界面附近的煤层具有相似的含气性特征.Abstract: Based on the measured data of Late Permian coal-bearing strata in western Guizhou Province, the sedimentary controlling factor of "unattached multiple superimposed coalbed-methane system" formation is preliminarily discussed in this paper. It shows that the depositional conditions of coal-bearing strata have laid the material physical properties foundation for "unattached multiple superimposed coalbed-methane system". The characteristics of sequence stratigraphic framework limit gas connectivity between gas units. The siderite mudstone with low-permeability, which is distributed near the maximum flooding surface, makes the vertical sub-strata of gas between the gas-bearing units relatively independent. There is correlation between coalbed methane contents and the sea level. Coalbed methane contents near to the maximum flooding surface are relatively low. The interface can be regarded as a stand-alone boundary for gas-forming units in the coalbed-methane system. The sequence boundary connects the gas units, making the coal seams near to sequence boundary with the similar gas bearing characteristics.
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图 4 海相沉积铁矿床铁矿物相分带示意(据姚凤良和郑明华,1983)
Fig. 4. Iron mineral phase zonation in marine sedimentary iron
表 1 ZZ1001孔岩石孔隙度测试结果
Table 1. Porosity test results of well ZZ1001
样品编号 岩性 层位 埋深(m) 块体密度(g/cm3) 体积密度(g/cm3) 蜡封法孔隙度(%) 压汞孔隙度(%) 1 碳质泥岩 3煤底板 115.21~117.20 2.46 2.64 6.818 181 818 3.195 7 2 泥质粉砂岩 5煤顶板 125.21~121.91 2.60 2.80 7.142 857 143 3.779 8 3 石灰岩 K3下 130.91~132.41 2.76 2.82 2.127 659 574 0.890 7 4 菱铁岩 6煤顶板 136.71~139.71 3.12 3.20 2.50 2.169 7 5 砂质泥岩 K5 5.561 3 6 泥岩 157.21~159.81 2.69 2.81 4.270 462 633 5.906 8 7 泥岩 157.21~159.81 2.61 2.76 5.434 782 609 5.5390 8 泥岩 13煤顶板 208.21~210.81 2.57 2.70 4.814 814 815 3.013 5 9 泥岩 14煤顶板 212.21~214.11 2.99 3.10 3.548 387 097 2.996 9 10 泥岩 22煤顶板 281.21~282.91 2.24 2.43 7.818 930 041 5.730 5 11 泥岩 22煤顶板 282.91~284.21 2.5 2.70 7.407 407 407 5.910 1 12 石灰岩 K7 290.27~293.01 2.68 2.77 3.249 097 473 1.095 5 13 粉砂岩 25煤顶板 299.01~ 2.76 2.91 5.154 639 175 3.590 4 14 泥岩 26煤顶板 314.2~317.21 2.59 2.74 5.474 452 555 3.419 3 15 泥质粉砂岩 27煤顶板 320.21~323.21 2.61 2.84 8.098 591 549 3.485 9 16 细砂岩 30煤顶板 344.21~347.01 2.68 2.81 4.626 334 52 2.537 2 17 泥岩 30煤顶板 347.01~350.01 2.54 2.70 5.925 925 926 2.155 7 18 石灰岩 K11 364.71~367.71 2.88 2.96 2.702 702 703 2.621 1 注:据杨兆彪,2011. -
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